<?php

namespace PHPExcel\Writer\Excel2007;

/**
 * PHPExcel
 *
 * Copyright (c) 2006 - 2015 PHPExcel
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * @category PHPExcel
 * @package PHPExcel_Writer_Excel2007
 * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 * @license http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt LGPL
 * @version ##VERSION##, ##DATE##
 */

/**
 * PHPExcel_Writer_Excel2007_Theme
 *
 * @category PHPExcel
 * @package PHPExcel_Writer_Excel2007
 * @copyright Copyright (c) 2006 - 2015 PHPExcel (http://www.codeplex.com/PHPExcel)
 */
class Theme extends WriterPart {
    /**
     * Map of Major fonts to write
     * 
     * @static array of string
     *        
     */
    private static $majorFonts = array(
    'Jpan' => 'ＭＳ Ｐゴシック',
    'Hang' => '맑은 고딕',
    'Hans' => '宋体',
    'Hant' => '新細明體',
    'Arab' => 'Times New Roman',
    'Hebr' => 'Times New Roman',
    'Thai' => 'Tahoma',
    'Ethi' => 'Nyala',
    'Beng' => 'Vrinda',
    'Gujr' => 'Shruti',
    'Khmr' => 'MoolBoran',
    'Knda' => 'Tunga',
    'Guru' => 'Raavi',
    'Cans' => 'Euphemia',
    'Cher' => 'Plantagenet Cherokee',
    'Yiii' => 'Microsoft Yi Baiti',
    'Tibt' => 'Microsoft Himalaya',
    'Thaa' => 'MV Boli',
    'Deva' => 'Mangal',
    'Telu' => 'Gautami',
    'Taml' => 'Latha',
    'Syrc' => 'Estrangelo Edessa',
    'Orya' => 'Kalinga',
    'Mlym' => 'Kartika',
    'Laoo' => 'DokChampa',
    'Sinh' => 'Iskoola Pota',
    'Mong' => 'Mongolian Baiti',
    'Viet' => 'Times New Roman',
    'Uigh' => 'Microsoft Uighur',
    'Geor' => 'Sylfaen' 
    );
    
    /**
     * Map of Minor fonts to write
     * 
     * @static array of string
     *        
     */
    private static $minorFonts = array(
    'Jpan' => 'ＭＳ Ｐゴシック',
    'Hang' => '맑은 고딕',
    'Hans' => '宋体',
    'Hant' => '新細明體',
    'Arab' => 'Arial',
    'Hebr' => 'Arial',
    'Thai' => 'Tahoma',
    'Ethi' => 'Nyala',
    'Beng' => 'Vrinda',
    'Gujr' => 'Shruti',
    'Khmr' => 'DaunPenh',
    'Knda' => 'Tunga',
    'Guru' => 'Raavi',
    'Cans' => 'Euphemia',
    'Cher' => 'Plantagenet Cherokee',
    'Yiii' => 'Microsoft Yi Baiti',
    'Tibt' => 'Microsoft Himalaya',
    'Thaa' => 'MV Boli',
    'Deva' => 'Mangal',
    'Telu' => 'Gautami',
    'Taml' => 'Latha',
    'Syrc' => 'Estrangelo Edessa',
    'Orya' => 'Kalinga',
    'Mlym' => 'Kartika',
    'Laoo' => 'DokChampa',
    'Sinh' => 'Iskoola Pota',
    'Mong' => 'Mongolian Baiti',
    'Viet' => 'Arial',
    'Uigh' => 'Microsoft Uighur',
    'Geor' => 'Sylfaen' 
    );
    
    /**
     * Map of core colours
     * 
     * @static array of string
     *        
     */
    private static $colourScheme = array(
    'dk2' => '1F497D',
    'lt2' => 'EEECE1',
    'accent1' => '4F81BD',
    'accent2' => 'C0504D',
    'accent3' => '9BBB59',
    'accent4' => '8064A2',
    'accent5' => '4BACC6',
    'accent6' => 'F79646',
    'hlink' => '0000FF',
    'folHlink' => '800080' 
    );
    
    /**
     * Write theme to XML format
     *
     * @param \PHPExcel\SpreadSheet $pPHPExcel            
     * @return string XML Output
     * @throws \PHPExcel\Writer\Exception
     */
    public function writeTheme(\PHPExcel\SpreadSheet $pPHPExcel = null) {
        // Create XML writer
        $objWriter = null;
        if ($this->getParentWriter()->getUseDiskCaching()) {
            $objWriter = new \PHPExcel\Shared\XMLWriter(\PHPExcel\Shared\XMLWriter::STORAGE_DISK, $this->getParentWriter()->getDiskCachingDirectory());
        } else {
            $objWriter = new \PHPExcel\Shared\XMLWriter(\PHPExcel\Shared\XMLWriter::STORAGE_MEMORY);
        }
        
        // XML header
        $objWriter->startDocument('1.0', 'UTF-8', 'yes');
        
        // a:theme
        $objWriter->startElement('a:theme');
        $objWriter->writeAttribute('xmlns:a', 'http://schemas.openxmlformats.org/drawingml/2006/main');
        $objWriter->writeAttribute('name', 'Office Theme');
        
        // a:themeElements
        $objWriter->startElement('a:themeElements');
        
        // a:clrScheme
        $objWriter->startElement('a:clrScheme');
        $objWriter->writeAttribute('name', 'Office');
        
        // a:dk1
        $objWriter->startElement('a:dk1');
        
        // a:sysClr
        $objWriter->startElement('a:sysClr');
        $objWriter->writeAttribute('val', 'windowText');
        $objWriter->writeAttribute('lastClr', '000000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:lt1
        $objWriter->startElement('a:lt1');
        
        // a:sysClr
        $objWriter->startElement('a:sysClr');
        $objWriter->writeAttribute('val', 'window');
        $objWriter->writeAttribute('lastClr', 'FFFFFF');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:dk2
        $this->writeColourScheme($objWriter);
        
        $objWriter->endElement();
        
        // a:fontScheme
        $objWriter->startElement('a:fontScheme');
        $objWriter->writeAttribute('name', 'Office');
        
        // a:majorFont
        $objWriter->startElement('a:majorFont');
        $this->writeFonts($objWriter, 'Cambria', self::$majorFonts);
        $objWriter->endElement();
        
        // a:minorFont
        $objWriter->startElement('a:minorFont');
        $this->writeFonts($objWriter, 'Calibri', self::$minorFonts);
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:fmtScheme
        $objWriter->startElement('a:fmtScheme');
        $objWriter->writeAttribute('name', 'Office');
        
        // a:fillStyleLst
        $objWriter->startElement('a:fillStyleLst');
        
        // a:solidFill
        $objWriter->startElement('a:solidFill');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gradFill
        $objWriter->startElement('a:gradFill');
        $objWriter->writeAttribute('rotWithShape', '1');
        
        // a:gsLst
        $objWriter->startElement('a:gsLst');
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '0');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '50000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '300000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '35000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '37000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '300000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '100000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '15000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '350000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:lin
        $objWriter->startElement('a:lin');
        $objWriter->writeAttribute('ang', '16200000');
        $objWriter->writeAttribute('scaled', '1');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gradFill
        $objWriter->startElement('a:gradFill');
        $objWriter->writeAttribute('rotWithShape', '1');
        
        // a:gsLst
        $objWriter->startElement('a:gsLst');
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '0');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '51000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '130000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '80000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '93000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '130000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '100000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '94000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '135000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:lin
        $objWriter->startElement('a:lin');
        $objWriter->writeAttribute('ang', '16200000');
        $objWriter->writeAttribute('scaled', '0');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:lnStyleLst
        $objWriter->startElement('a:lnStyleLst');
        
        // a:ln
        $objWriter->startElement('a:ln');
        $objWriter->writeAttribute('w', '9525');
        $objWriter->writeAttribute('cap', 'flat');
        $objWriter->writeAttribute('cmpd', 'sng');
        $objWriter->writeAttribute('algn', 'ctr');
        
        // a:solidFill
        $objWriter->startElement('a:solidFill');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '95000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '105000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:prstDash
        $objWriter->startElement('a:prstDash');
        $objWriter->writeAttribute('val', 'solid');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:ln
        $objWriter->startElement('a:ln');
        $objWriter->writeAttribute('w', '25400');
        $objWriter->writeAttribute('cap', 'flat');
        $objWriter->writeAttribute('cmpd', 'sng');
        $objWriter->writeAttribute('algn', 'ctr');
        
        // a:solidFill
        $objWriter->startElement('a:solidFill');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:prstDash
        $objWriter->startElement('a:prstDash');
        $objWriter->writeAttribute('val', 'solid');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:ln
        $objWriter->startElement('a:ln');
        $objWriter->writeAttribute('w', '38100');
        $objWriter->writeAttribute('cap', 'flat');
        $objWriter->writeAttribute('cmpd', 'sng');
        $objWriter->writeAttribute('algn', 'ctr');
        
        // a:solidFill
        $objWriter->startElement('a:solidFill');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:prstDash
        $objWriter->startElement('a:prstDash');
        $objWriter->writeAttribute('val', 'solid');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:effectStyleLst
        $objWriter->startElement('a:effectStyleLst');
        
        // a:effectStyle
        $objWriter->startElement('a:effectStyle');
        
        // a:effectLst
        $objWriter->startElement('a:effectLst');
        
        // a:outerShdw
        $objWriter->startElement('a:outerShdw');
        $objWriter->writeAttribute('blurRad', '40000');
        $objWriter->writeAttribute('dist', '20000');
        $objWriter->writeAttribute('dir', '5400000');
        $objWriter->writeAttribute('rotWithShape', '0');
        
        // a:srgbClr
        $objWriter->startElement('a:srgbClr');
        $objWriter->writeAttribute('val', '000000');
        
        // a:alpha
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', '38000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:effectStyle
        $objWriter->startElement('a:effectStyle');
        
        // a:effectLst
        $objWriter->startElement('a:effectLst');
        
        // a:outerShdw
        $objWriter->startElement('a:outerShdw');
        $objWriter->writeAttribute('blurRad', '40000');
        $objWriter->writeAttribute('dist', '23000');
        $objWriter->writeAttribute('dir', '5400000');
        $objWriter->writeAttribute('rotWithShape', '0');
        
        // a:srgbClr
        $objWriter->startElement('a:srgbClr');
        $objWriter->writeAttribute('val', '000000');
        
        // a:alpha
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', '35000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:effectStyle
        $objWriter->startElement('a:effectStyle');
        
        // a:effectLst
        $objWriter->startElement('a:effectLst');
        
        // a:outerShdw
        $objWriter->startElement('a:outerShdw');
        $objWriter->writeAttribute('blurRad', '40000');
        $objWriter->writeAttribute('dist', '23000');
        $objWriter->writeAttribute('dir', '5400000');
        $objWriter->writeAttribute('rotWithShape', '0');
        
        // a:srgbClr
        $objWriter->startElement('a:srgbClr');
        $objWriter->writeAttribute('val', '000000');
        
        // a:alpha
        $objWriter->startElement('a:alpha');
        $objWriter->writeAttribute('val', '35000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:scene3d
        $objWriter->startElement('a:scene3d');
        
        // a:camera
        $objWriter->startElement('a:camera');
        $objWriter->writeAttribute('prst', 'orthographicFront');
        
        // a:rot
        $objWriter->startElement('a:rot');
        $objWriter->writeAttribute('lat', '0');
        $objWriter->writeAttribute('lon', '0');
        $objWriter->writeAttribute('rev', '0');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:lightRig
        $objWriter->startElement('a:lightRig');
        $objWriter->writeAttribute('rig', 'threePt');
        $objWriter->writeAttribute('dir', 't');
        
        // a:rot
        $objWriter->startElement('a:rot');
        $objWriter->writeAttribute('lat', '0');
        $objWriter->writeAttribute('lon', '0');
        $objWriter->writeAttribute('rev', '1200000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:sp3d
        $objWriter->startElement('a:sp3d');
        
        // a:bevelT
        $objWriter->startElement('a:bevelT');
        $objWriter->writeAttribute('w', '63500');
        $objWriter->writeAttribute('h', '25400');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:bgFillStyleLst
        $objWriter->startElement('a:bgFillStyleLst');
        
        // a:solidFill
        $objWriter->startElement('a:solidFill');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gradFill
        $objWriter->startElement('a:gradFill');
        $objWriter->writeAttribute('rotWithShape', '1');
        
        // a:gsLst
        $objWriter->startElement('a:gsLst');
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '0');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '40000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '350000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '40000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '45000');
        $objWriter->endElement();
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '99000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '350000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '100000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '20000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '255000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:path
        $objWriter->startElement('a:path');
        $objWriter->writeAttribute('path', 'circle');
        
        // a:fillToRect
        $objWriter->startElement('a:fillToRect');
        $objWriter->writeAttribute('l', '50000');
        $objWriter->writeAttribute('t', '-80000');
        $objWriter->writeAttribute('r', '50000');
        $objWriter->writeAttribute('b', '180000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gradFill
        $objWriter->startElement('a:gradFill');
        $objWriter->writeAttribute('rotWithShape', '1');
        
        // a:gsLst
        $objWriter->startElement('a:gsLst');
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '0');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:tint
        $objWriter->startElement('a:tint');
        $objWriter->writeAttribute('val', '80000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '300000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:gs
        $objWriter->startElement('a:gs');
        $objWriter->writeAttribute('pos', '100000');
        
        // a:schemeClr
        $objWriter->startElement('a:schemeClr');
        $objWriter->writeAttribute('val', 'phClr');
        
        // a:shade
        $objWriter->startElement('a:shade');
        $objWriter->writeAttribute('val', '30000');
        $objWriter->endElement();
        
        // a:satMod
        $objWriter->startElement('a:satMod');
        $objWriter->writeAttribute('val', '200000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:path
        $objWriter->startElement('a:path');
        $objWriter->writeAttribute('path', 'circle');
        
        // a:fillToRect
        $objWriter->startElement('a:fillToRect');
        $objWriter->writeAttribute('l', '50000');
        $objWriter->writeAttribute('t', '50000');
        $objWriter->writeAttribute('r', '50000');
        $objWriter->writeAttribute('b', '50000');
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        $objWriter->endElement();
        
        // a:objectDefaults
        $objWriter->writeElement('a:objectDefaults', null);
        
        // a:extraClrSchemeLst
        $objWriter->writeElement('a:extraClrSchemeLst', null);
        
        $objWriter->endElement();
        
        // Return
        return $objWriter->getData();
    }
    
    /**
     * Write fonts to XML format
     *
     * @param \PHPExcel\Shared\XMLWriter $objWriter            
     * @param string $latinFont            
     * @param
     *            array of string $fontSet
     * @return string XML Output
     * @throws \PHPExcel\Writer\Exception
     */
    private function writeFonts($objWriter, $latinFont, $fontSet) {
        // a:latin
        $objWriter->startElement('a:latin');
        $objWriter->writeAttribute('typeface', $latinFont);
        $objWriter->endElement();
        
        // a:ea
        $objWriter->startElement('a:ea');
        $objWriter->writeAttribute('typeface', '');
        $objWriter->endElement();
        
        // a:cs
        $objWriter->startElement('a:cs');
        $objWriter->writeAttribute('typeface', '');
        $objWriter->endElement();
        
        foreach ( $fontSet as $fontScript => $typeface ) {
            $objWriter->startElement('a:font');
            $objWriter->writeAttribute('script', $fontScript);
            $objWriter->writeAttribute('typeface', $typeface);
            $objWriter->endElement();
        }
    }
    
    /**
     * Write colour scheme to XML format
     *
     * @param \PHPExcel\Shared\XMLWriter $objWriter            
     * @return string XML Output
     * @throws \PHPExcel\Writer\Exception
     */
    private function writeColourScheme($objWriter) {
        foreach ( self::$colourScheme as $colourName => $colourValue ) {
            $objWriter->startElement('a:' . $colourName);
            
            $objWriter->startElement('a:srgbClr');
            $objWriter->writeAttribute('val', $colourValue);
            $objWriter->endElement();
            
            $objWriter->endElement();
        }
    }
}
